Doug
Here are some prints for you to peruse.
1.The Alternator is of the self-excited rotating armature type. The armature carries two sets of windings, one the A.C. winding which is connected to a pair of slip-rings and the other the D.C. winding which is connected to a commutator and provides excitation current to the main field system. The alternator also incorporates series starting windings which combine with the D.C. armature winding to act as a series motor for cranking the engine.
This information is from a 1959 Lister manual.
I got a striped down 4.5kw startomatic alternator I decided to have a go at rebuilding it myself. I got as much information about it as I could all of the above and more field coil resistances, brush sizes, brush material, bearing sizes and worked how it all went back together. There were loads of missing bolts a broken brush holder I tested the resistances worked out which wires went where i got new brushes made, got the commutator and slip rings skimed, bought new bearings, made a new brush holder from 10mm tufnol rod, bought new BSW and BA nuts and bolts. I rewired the top box to Lister push button remote control design this does away with the startomatic box and makes life easier for me
Commutator skim 15
Bearings 35
Brushes 56
Bolts 20
Brush holder 6
Heat shrink 2
Flexible mountings 6
Relays & Switches 20
Wire 7
Connectors 5
Total 172 gbp
Here are some pictures of what I started with but unfortunately I didnt take pictures of the rebuild when I did it but will if anyone is interested.
Mick